Wi-Fi Won't Connect: A Complete Diagnosis and Fix Guide

Are you trying to connect to Wi-Fi, but the network stubbornly ignores your attempts? Messages like "Unable to connect to the network", "Authentication failed" or infinite Obtaining an IP address are familiar to everyone. The reasons may lie in the device (phone, laptop, Smart TV), as well as in the router—or even at the internet provider. In this article, we'll look at all possible Wi-Fi connection failure scenarios, including rare cases that are not covered in standard instructions.

We won't list trivial tips like "reboot your router" (although that sometimes works). Instead, we'll provide an in-depth analysis. technical reasons with step-by-step instructions for Windows 10/11, Android, iOS And Smart TV (including Samsung Tizen, LG webOS And Android TV). At the end of the article there is a table with decoding of Wi-Fi error codes and FAQ for specific router models (TP-Link, ASUS, Keenetic).

1. Diagnosing the problem: device or router?

The first step is to determine, where exactly the failure occurredIf Wi-Fi does not connect on only one device (for example, on iPhone, but it works on a laptop), the problem is most likely with it. If they refuse to connect all gadgets — the router or the provider is to blame.

Take a quick test:

• 📱 Try connecting to the same network from another device (phone, tablet, second laptop).
• 🔄 Reboot your router (unplug it from the power outlet for 30 seconds, then plug it back in).
• 🌐 Check if the indicator is on Internet on the router (if not, the problem is with the provider).
• 📡 Make sure that Wi-Fi is enabled on your router (button WPS/Wi-Fi should be on or flashing).

If Wi-Fi works after rebooting the router, the problem was a temporary DHCP (the protocol that assigns IP addresses) glitch. If not, read on.

2. Authentication errors: "Incorrect password" or "Authentication failed"

Message "Incorrect password" or "Authentication failed" Appears when the device cannot confirm network access. Causes:

• 🔑 You entered Incorrect password (case sensitive! Password ≠ password).
• 🔄 The password on the router has changed, but the device is trying to connect using the old information.
• 🛡️ Filtering by is enabled MAC address (the router blocks unknown devices).
• 📶 An outdated security type is used (WEP instead of WPA2/WPA3).

How to fix:

1. Please make sure you entered your password correctly. Android And iOS You can see the characters you entered by clicking the eye icon (👁️) in the password field.
2. On Windows remove the network from the list and reconnect:

   Settings → Network & Internet → Wi-Fi → Manage known networks → [Select a network] → Forget

3. Check your router's security settings (see section 4).

How to find out your Wi-Fi password if you forgot it?

If you have access to the router, go to its web interface (usually at 192.168.0.1 or 192.168.1.1, login/password — admin/admin or indicated on the sticker). Go to the section Wireless → Wireless Security (names may vary). The password will be in the field PSK Password or Network Key.

⚠️ Attention: If you changed the default login/password for logging into the router and forgot it, you will have to reset it to factory settings (button Reset on the back panel). This will delete all personal settings, including the Wi-Fi password!

3. Endless "Obtaining IP Address": Why the device is not receiving network settings

If the device sees the network, but it freezes at the stage Obtaining an IP address (on Android) or Connection (on Windows), the problem is in the protocol DHCPThis means the router cannot automatically assign an IP address to the device. Reasons:

• 🔌 DHCP server failure on the router.
• 📱 The device has a manually assigned static IP address that conflicts with the router's range.
• 🛡️ IP to MAC address binding is enabled in the router, but your device is not listed.
• 🔄 The IP address range on the router is exhausted (too many devices are connected).

Solutions:

Delete the network and reconnect|Reboot the router|Check DHCP settings in the web interface|Disable static IP on the device|Reset network settings on the device-->

On Android reset network settings:

Settings → System → Reset → Reset Wi-Fi, mobile network, and Bluetooth settings

On Windows 10/11 run in command line (Win + R → cmd):

ipconfig /release
ipconfig /renew

⚠️ Attention: If after resetting network settings on Android Saved passwords for other Wi-Fi networks have disappeared and will need to be re-entered. We recommend taking screenshots of the network list in Settings beforehand.

4. Router Settings: Hidden Parameters That Break Wi-Fi

If the problem is not with the device, but with the router, you need to check its configuration. Go to the web interface (usually at 192.168.0.1 or 192.168.1.1) and pay attention to the following parameters:

Pay special attention Wi-Fi channelIf you have multiple networks in your home, they may overlap. Use utilities like Wi-Fi Analyzer (For Android) or inSSIDer (For Windows) to find the least loaded channel and set it manually in the router settings.

5. Problems with drivers and network adapters (Windows, macOS, Linux)

If Wi-Fi does not connect only on PC or laptop, it might be my fault network adapter driver or its settings. Symptoms:

• 🖥️ Your network is not displayed at all in the list of networks.
• ⚠️ There is an exclamation mark next to the Wi-Fi icon in the tray.
• 🔌 In Device Manager There is a yellow triangle next to the adapter.

Solutions for Windows 10/11:

1. Update driver:

   Right-click Start → Device Manager → Network Adapters → [Your Wi-Fi Adapter] → Update Driver

2. Uninstall the current driver and install it from the manufacturer's website (for Intel, Realtek, Broadcom and others).
3. Reset the TCP/IP stack:

   Command prompt (as administrator) → netsh int ip reset

4. Disable adapter power saving mode:

   Device Manager → [Adapter] → Properties → Power Management → Uncheck "Allow shutdown..."

For macOS reset network settings:

System Preferences → Network → Select Wi-Fi → [–] Remove Service → Apply

⚠️ Attention: If after updating the driver Wi-Fi disappeared from the list of devices, check whether the adapter is disabled by hardware (on some laptops there is a physical button or combination Fn + F2/F12).

6. Smart TV and set-top boxes: why won't my TV connect to Wi-Fi?

Smart TV (Samsung, LG, Sony, Xiaomi) and prefixes (Apple TV, NVIDIA Shield, Xiaomi Mi Box) often suffer from Wi-Fi problems due to outdated firmware or incompatibility with router settings. Common errors:

• 📺 "Unable to connect to the network" (on Samsung Tizen).
• 🔴 "IP Error" (on LG webOS).
• 🔄 Infinite loading when connected (on Android TV).

What to do:

1. Update your TV firmware:

   Settings → Support → Software Update → Update Now

2. Change the router security type to WPA2-PSK (AES) (Not TKIP!).
3. Turn it off IPv6 in the router settings (some Smart TV (they don't work well with him).
4. If your TV connects to 2.4GHz but not 5GHz, check if it supports that band (older models may not have a 5GHz module).

For Android TV (including Xiaomi Mi Box, NVIDIA Shield) try:

Settings → Network & Internet → Wi-Fi → [Your network] → Forget → Reconnect

7. Problems with your provider: how to check and what to do

If no device connects to Wi-Fi and the indicator Internet If the router light is off or flashing red, there's a problem with your ISP. Possible causes:

• 💰 Unpaid bill (provider blocked access).
• 🔌 Cable damage (if you have PPPoE, L2TP or Dynamic IP).
• 🛠️ Technical work on the line.
• 🔄 Failure in the provider's equipment (DDoS attack, DHCP error).

How to check:

1. Connect the provider's cable directly to PC/laptop (if there is a port Ethernet). If the internet doesn't work, the problem is definitely not with the router.
2. Call your provider's support team (the number is usually listed in your contract or on a sticker on your router).
3. Check the service status on the provider's website (section "Information" or "Technical work").

⚠️ Attention: If you have PPPoE connection (requires login/password), make sure this information hasn't been reset in your router settings. Sometimes, after updating the router firmware, it's reset.

8. Rare cases: when Wi-Fi doesn't connect for unobvious reasons

If all standard methods fail, the problem may be one of these rare scenarios:

• 🕒 Time limit (the router has a Wi-Fi schedule configured, for example, only during the day).
• 📱 IP conflict (two devices on the network received the same IP).
• 🔋 Energy saving (on some Android- Wi-Fi devices are disabled in sleep mode).
• 🛡️ VPN or firewall (blocks connection to local network).
• 📡 Interference from other devices (microwaves, wireless speakers, baby monitors).

For diagnostics:

1. Check it out router logs (chapter System Log or Journal). Look for errors like DHCP lease failed or Authentication rejected.
2. Turn it off VPN And antivirus on the device.
3. Try connecting to Wi-Fi in safe mode (Windows) or after hard reboot (Android).

How to enable event logging on a router TP-Link?

Go to Advanced → System Tools → System Log. Turn on Enable System Log and set the level DebugAfter this, all connection errors will be recorded in a log, which can be downloaded and analyzed.

FAQ: Answers to Frequently Asked Questions

📱 Why won't my iPhone connect to Wi-Fi, but my Android can?

iPhone And iPad sometimes conflict with router settings, especially if:

• On 802.11r (Fast Roaming) - disable it in your router settings.
• Used WPA3 - try switching to WPA2.
• It's non-standard DNS - reset it in the Wi-Fi settings on iPhone (Settings → Wi-Fi → [i] next to the network → Configure DNS → Automatic).

Resetting network settings will also help: Settings → General → Transfer or reset iPhone → Reset → Reset Network Settings.

💻 Why does my laptop see the network but not connect to Wi-Fi after sleep?

This is a typical driver problem. Realtek and some models IntelSolutions:

1. Update the adapter driver from official Intel website or Realtek.
2. Disable the Turn off device to save power permission (see section 5).
3. IN Control Panel → Power Options → Change plan settings → Change advanced settings find Wireless Network Adapter Settings → Power Saving Mode and install Maximum performance.

📺 Why does my Smart TV connect to Wi-Fi but not the internet?

If your TV connects to the network but pages don't load, check:

• Settings DNS (try to write it manually 8.8.8.8 And 8.8.4.4).
• Settings Proxy (must be disabled).
• Firmware updates (on some LG webOS Old versions do not support modern websites due to outdated TLS).

On Android TV also check if the mode is turned on Limited access (in some firmware it blocks part of the traffic).

🔄 Why does Wi-Fi connect but disconnect after 5 minutes?

Reasons for periodic breaks:

• Channel congestion — change the Wi-Fi channel in the router settings (see section 4).
• Weak signal — check the signal level in the device settings (if below 30%, try moving the router).
• DHCP timeout - increase the IP lease time in the router settings (section DHCP → Lease Time, install 24 hours).
• Energy saving - disable the option Wi-Fi in sleep mode on Android.

🛡️ How to protect your Wi-Fi from hacking if it's constantly glitching?

Unstable Wi-Fi performance may be a sign network hacking (if any external devices are connected to it). To check:

1. Go to the router's web interface in the section DHCP Clients List or Connected Devices — there will be a list of all connected gadgets.
2. If you see unfamiliar devices, change your Wi-Fi password and turn it on. MAC filtering (allow only your gadgets to connect).
3. Turn it off WPS (This is a vulnerable protocol that can be easily hacked).
4. Update your router firmware to the latest version.

It is also recommended to use WPA3 instead of WPA2 (if all your devices support it).